Pump wavelength-dependent terahertz spin-to-charge conversion in CoFeB/MgO Rashba interface

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Abstract

Spin/charge interconversion mechanisms provide an essential handle to generate and detect spin currents. Their applications at different timescales are critical in spintronics since they cover a technologically relevant broadband spectrum. While the inverse spin Hall effect is known to be robust from quasi-static to sub-picosecond timescales, the conversion efficiency evolution of the inverse Edelstein effect has not been addressed yet. In this work, we report that while the quasi-static response of the inverse Edelstein effect can be comparable to that of the most efficient inverse spin Hall systems, a drastic drop of efficiency is observed in the terahertz (THz) regime. This behavior at the sub-picosecond timescale is qualitatively understood from the dependence of the inverse Edelstein effect on the energy distribution of spin-carrier entities, which is different between thermalized carriers in the quasi-static regime and hot carriers generated by light pulses. This finding is supported by the pump-laser wavelength dependence in the THz regime for the inverse Edelstein effect, which offers a promising route for tunability of spintronic devices.

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Levchuk, A., Juvé, V., Otomalo, T. O., Chirac, T., Rousseau, O., Solignac, A., … Viret, M. (2023). Pump wavelength-dependent terahertz spin-to-charge conversion in CoFeB/MgO Rashba interface. Applied Physics Letters, 123(1). https://doi.org/10.1063/5.0144645

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